What is the purpose of water fire protection for LNG storage tanks? Can’t water be sprayed after an LNG leak?

Used for extinguishing fires when they occur.

◇ Cooling: A fixed water spray cooling system is installed at the top of LNG storage tanks, valves, pipelines, etc； Fixed fire monitors and fire hydrants are installed outside the fire dike. ◇ Fire extinguishing: Fixed dry powder fire extinguishing systems are installed on the roof of the LNG storage tanks for fire suppression ； The liquid collection tank within the tank farm is equipped with a fixed-high-expansion foam fire suppression system to control the evaporation of LNG that leaks into the LNG liquid collection tank. ◇ The tank top is equipped with a crane powered by an explosion-proof motor, capable of lifting 500 kg. ◇ Sprinkler systems are installed on the top of the tank, as well as on the steel platforms and at the root valve assemblies. ◇ When the gas leak alarm is activated, the emergency shut-off valves at the inlet and outlet of the tank close automatically, and audible and visual alarms are triggered both at the site and in the control room. If a large amount of LNG leaks, the high-expansion foam generator fire suppression system is manually activated. ◇ The tank area is equipped with a flame detection and alarm system; once a flame is detected, the emergency shut-off valves at the inlet and outlet of the storage tanks close automatically, and the sprinkler system is activated to provide spray protection for the equipment. ◇ An automatic dry powder fire extinguishing system is installed at the top of the tank and at the valves at its base, to promptly extinguish incipient fires in the event of a blaze.

The cooling water on the walls of the filling tank is used to lower the temperature of the tank’s walls, not for extinguishing fires

After a leak, there’s no need to spray water; it’s only necessary to maintain the pressure in the storage tank, and then the tank needs to be emptied

Since the heat transfer coefficient between liquid water and the pipe walls is **higher than that of gas, spraying water into LNG storage tanks may accelerate the vaporization of LNG inside the tanks (the vaporization temperature of LNG is around -160 degrees Celsius under normal pressure).

It is used to cool down during a fire. . . . .

In the event of a fire, the tanks that have not been affected are cooled down overnight, while the tank involved in the incident does not have its sprinkler system activated.

Multiple-stage foam fire extinguishing, water cooling for temperature reduction